Sneezes can travel 300 miles an hour (about 483 km/hr) or faster, and one sneeze can release as many as 40,000 infectious droplets with a spray radius of about 5 feet (1.52 m). Although much of this comes out of the nose, people tend to sneeze with their mouths at least partially open, too, so a considerable amount of air and droplets comes out of the mouth.
More facts about sneezes:
Sneezes usually are caused by something stimulating the membranes inside the nose, but they can also be caused by an infection, a sudden exposure to light — called a photo sneeze reflex — having sex, working out and even the sensation of fullness after a very large meal, which is called snatiation.
Contrary to popular belief, it is possible to sneeze with your eyes open, and your heart does not stop when you sneeze.
The sneeziest animal is the iguana, which also releases the most material per sneeze.